12831220 has 24 divisors (see below), whose sum is σ = 27052704. Its totient is φ = 5112096.

The previous prime is 12831211. The next prime is 12831223. The reversal of 12831220 is 2213821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12831223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4527 + ... + 6793.

It is an arithmetic number, because the mean of its divisors is an integer number (1127196).

Almost surely, 2^12831220 is an apocalyptic number.

12831220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12831220 is an abundant number, since it is smaller than the sum of its proper divisors (14221484).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12831220 is a wasteful number, since it uses less digits than its factorization.

12831220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2559 (or 2557 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 12831220 is about 3582.0692343951. The cubic root of 12831220 is about 234.1114476305. Note that the first 3 decimals are identical.

The spelling of 12831220 in words is "twelve million, eight hundred thirty-one thousand, two hundred twenty".